Foam nest builders create a nest at the surface of the water or under water. The foam nest consists of bubbles with a mucus membrane usually constructed by the male. Surface nests are placed in floating plant matter and subsurface foam nests can be placed on any stable substrate. This includes stone, wood and plant matter. Depending on the species of labyrinth fish, they will use a natural site that is suitable or one of the adults may construct a suitable site for the foam nest. Free- spawning species will not construct a nest of any kind. They simply spawn and the eggs either float or sink and no parental care is given. Mouth brooding species also do not create a nest of any kind. When spawning occurs the male will catch the eggs in the anal fin and the female then picks them out and places them in the male’s mouth for incubation. Species that do not catch the eggs will allow them sink to the bottom, and the male then collects them after spawning has ceased. Floating eggs contain oil and are lighter than water. After spawning the buoyant eggs rise to the surface. The yolk sacks of the hatched larvae contain oil so the larvae also float to the surface. Floating eggs are generally the smallest and the larvae have relatively small yolk sacks. The larvae receive little parental care and require suitable feeds early in the larval life cycle. Labyrinth fish with floating eggs are free spawners or foam nest builders. Sinking eggs do not contain oil and are heavier than water and sink after spawning. Sinking eggs are generally larger and the larvae have larger egg sacks. The larvae do not require suitable feeds as early in the larval stage as the floating eggs, but are able to utilize larger feed items once they begin to feed. Labyrinth fish with sinking eggs are either foam nest builders or mouth breeders (Scheurmann 1989). Table (3) lists some common species and their spawning method.